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Makinggreen tells you what are the factors that cause the ammonia nitrogen to exceed the standard?

Time : 2020-04-15

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Makinggreen tells you what are the factors that cause the ammonia nitrogen to exceed the standard?
I often hear people mention the term "ammonia nitrogen exceeding standard". Do you know why the ammonia nitrogen exceeds the standard? Next, Makinggreen Environmental Protection will take you to understand the factors that cause the ammonia nitrogen to exceed the standard. Let's take a look together?
 
01. The ammonia nitrogen caused by organic matter exceeds the standard
High ammonia nitrogen wastewater with a CN ratio of less than 3 requires a carbon source to increase the completeness of denitrification because the denitrification process requires a CN ratio of 4 to 6. The carbon source added was methanol. For some reason, the outlet valve of the methanol storage tank fell off, and a large amount of methanol entered the pool A, resulting in a lot of foam in the aeration tank. The effluent COD and ammonia nitrogen surged and the system collapsed.
  
Analysis:
A large amount of carbon source enters the A pool, denitrification cannot be used, and enters the aeration tank, because the substrate is sufficient, the heterotrophic bacteria aerobic metabolism, a large amount of oxygen and trace elements are consumed, because the nitrifying bacteria are autotrophic bacteria, poor metabolic capacity, oxygen The competition cannot form dominant bacteria, so the nitrification reaction is restricted and the ammonia nitrogen is increased.
  
Solution:
(1) Immediately stop the water inlet for smoldering and continuous opening of internal and external reflux;
(2) Stop pressing mud to ensure sludge concentration;
(3) If organic matter has caused swelling of non-filamentous bacteria, PAC can be added to increase the flocculation of sludge, and defoamer can be added to eliminate impact foam.


02. The ammonia nitrogen caused by internal reflux exceeds the standard
There are several reasons for the excessive ammonia nitrogen caused by the internal reflux: the internal reflux pump has electrical faults (the operating signal is thrown at the site when the trip is stopped), mechanical faults (the impeller falls off), and human causes (the internal reflux pump has not tried positive and reverse, the scene is reverse Turn state).
  
Analysis:
Ammonia nitrogen exceeding the standard caused by internal reflux can also be attributed to the impact of organic matter, because there is no reflux of nitrification liquid, resulting in only a small amount of nitrate nitrogen carried by external reflux in the A pool, which is generally an anaerobic environment. The carbon source will only be hydrolyzed and acidified without Completely metabolized into carbon dioxide to escape. Therefore, a large amount of organic matter enters the aeration tank, resulting in an increase in ammonia nitrogen.
  
Solution:
The problem of internal reflux is easy to find. You can judge whether it is a problem caused by internal reflux through data and trends: the initial nitrate nitrogen at the outlet of the O pool increases, the nitrate nitrogen at the A pool decreases to 0, the pH decreases, etc., so the solution is divided three situations:
(1) If problems are found in time, it is sufficient to repair the internal reflux pump;
(2) The internal reflux has caused the ammonia nitrogen to rise, and the internal reflux pump should be repaired to stop or reduce the water intake for smoldering;
(3) The nitrification system has collapsed, and the water inflow is stopped. If conditions and conditions are more urgent, biochemical sludge from a similar denitrification system can be added to speed up the system recovery.


03. The ammonia nitrogen exceeds the standard caused by too low pH
There are three cases of ammonia nitrogen exceeding the standard caused by low pH:
(1) The internal reflux is too large or the aeration at the internal reflux is too large, which leads to carrying a large amount of oxygen into the A pool, destroying the anoxic environment, aerobic metabolism of denitrifying bacteria, and some organic substances are metabolized by aerobic, which seriously affects the The integrity of nitrification, because denitrification can compensate for half of the alkalinity metabolized by the nitrification reaction, so the destruction of the anoxic environment leads to a decrease in alkalinity and a decrease in pH. After the pH is lower than the appropriate pH for nitrifying bacteria, the nitrification reaction is inhibited and ammonia Rise. This situation may be encountered by some colleagues, but never find a reason in this regard.
(2) The influent CN ratio is insufficient due to incomplete denitrification and low alkalinity, resulting in a drop in pH.
(3) The pH of the inlet water decreases continuously due to the decrease in alkalinity.
  
Analysis:
The ammonia nitrogen exceeding the standard caused by the decrease in pH has a lower probability of occurrence in practice, because the continuous decrease of pH is a process. Generally, the operator starts adding alkali to adjust the pH when there is no problem.
  
Solution:
(1) The problem of too low pH is actually very simple. It is found that if the pH drops continuously, it is necessary to start adding alkali to maintain the pH, and then analyze to find the cause.
(2) If the pH is too low, it has caused the system to collapse. When the pH is between 5.8 and 6, the nitrification system has not collapsed. First, the pH of the system must be replenished, and then the same type of sludge should be smothered or added.
  
Makinggrren Environmental Protection will introduce you here for the time being, and continue to pay attention to Mianjin Environmental Protection ~
  
Makinggrren Environmental Protection Technology (Shanghai) Co., Ltd. is committed to bringing internationally advanced water, gas, solid waste treatment technology and operation management concepts to professional customers in the Chinese market, providing customers with mature, stable, cost-effective overall solutions. We have an expert team composed of domestic and foreign water treatment environmental engineers and well-known professors. We have several independent invention patents and biological treatment core technology process packages to provide nanny lists for customers' sewage treatment systems, exhaust gas systems and sludge solid waste treatment projects. service.
  
Companies adhering to the "take from nature, anti-replenishment of nature" concept, has a variety of microbial strains and biological nutrition products can be widely used in wastewater, waste gas, river treatment and other environmental protection fields. The company has participated in leading nearly 100 large-scale environmental protection projects at home and abroad. Typical domestic customers include Sinopec, PetroChina, Shenhua Group, Baosteel Group, Roche Pharmaceutical, Formosa Plastics Group, etc. At the same time, the company and the Chinese Academy of Sciences, Tongji University, Central South University, Zhejiang University of Technology and other scientific research institutions and well-known universities jointly research and develop, and strive to become a comprehensive professional environmental protection company integrating production and sales, project EPC general contracting, ecological environment consulting services, and contract operation.